code: def test_shrink_max(self):
      it = Tensor.randn(8).cast(dtypes.imagef((1, 2, 4))).realize()
      imgv = it.numpy()
      np.testing.assert_equal(
          np.maximum(imgv[0:3], 0), it[0:3].relu().numpy()
      )
  
file_path: tinygrad/test/test_image_dtype.py
imports: import unittest
  import numpy
  from tinygrad import Device, dtypes, Tensor, Variable
  from tinygrad.dtype import ImageDType
  from tinygrad.features.image import to_image_idx
label_desc: Use image node_id 5 for calling the TestImageDType obj's underlying member method code with example usage: obj.test_shrink_max() without return types